气候变化领域集成服务门户(CCPortal): Development and calibration of an automatic spectral albedometer to estimate near-surface snow SSA time series

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DOI	10.5194/tc-10-1297-2016
	Development and calibration of an automatic spectral albedometer to estimate near-surface snow SSA time series
	Picard G.; Libois Q.; Arnaud L.; Verin G.; Dumont M.
发表日期	2016
ISSN	19940416
卷号	10 期号:3
英文摘要	Spectral albedo of the snow surface in the visible/near-infrared range has been measured for 3 years by an automatic spectral radiometer installed at Dome C (75°S, 123°E) in Antarctica in order to retrieve the specific surface area (SSA) of superficial snow. This study focuses on the uncertainties of the SSA retrieval due to instrumental and data processing limitations. We find that when the solar zenith angle is high, the main source of uncertainties is the imperfect angular response of the light collectors. This imperfection introduces a small spurious wavelength-dependent trend in the albedo spectra which greatly affects the SSA retrieval. By modeling this effect, we show that for typical snow and illumination conditions encountered at Dome C, retrieving SSA with an accuracy better than 15ĝ€% (our target) requires the difference of response between 400 and 1100ĝ€nm to not exceed 2ĝ€%. Such a small difference can be achieved only by (i) a careful design of the collectors, (ii) an ad hoc correction of the spectra using the actual measured angular response of the collectors, and (iii) for solar zenith angles less than 75°. The 3-year time series of retrieved SSA features a 3-fold decrease every summer which is significantly larger than the estimated uncertainties. This highlights the high dynamics of near-surface SSA at Dome C. © Author(s) 2016. CC Attribution 3.0 License.
学科领域	albedo; calibration; data processing; equipment; estimation method; light intensity; radiometer; snow; spectral analysis; time series; zenith angle; Antarctica; Dome Concordia; East Antarctica
语种	英语
scopus关键词	albedo; calibration; data processing; equipment; estimation method; light intensity; radiometer; snow; spectral analysis; time series; zenith angle; Antarctica; Dome Concordia; East Antarctica
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119631
作者单位	UGA/CNRS, Laboratoire de Glaciologie et Géophysique de l'Environnement (LGGE) UMR 5183, Grenoble, 38041, France; ACE CRC, University of Tasmania, Private Bag 80, Hobart, TAS 7001, Australia; Météo-France - CNRS, CNRM - GAME UMR 3589, Centre d'Études de la Neige, Grenoble, France; Now At: ESCER Centre, Department of Earth and Atmospheric Sciences, Université du Québec À Montréal (UQAM), Montréal, Canada
推荐引用方式 GB/T 7714	Picard G.,Libois Q.,Arnaud L.,et al. Development and calibration of an automatic spectral albedometer to estimate near-surface snow SSA time series[J],2016,10(3).
APA	Picard G.,Libois Q.,Arnaud L.,Verin G.,&Dumont M..(2016).Development and calibration of an automatic spectral albedometer to estimate near-surface snow SSA time series.Cryosphere,10(3).
MLA	Picard G.,et al."Development and calibration of an automatic spectral albedometer to estimate near-surface snow SSA time series".Cryosphere 10.3(2016).